(4) answer in three or four sentence (4.2) the pest are killed quickly in chemical control method then why is is the the help of biological control method taken to ensure the death of these animal?
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Pests are killed quickly in the chemical control method but this procedure is harmful. Explanation: The pesticides that are used for killing of pests are toxic to the environment. ... As a result of eutrophication, the toxic chemicals get wash off in the near by river or sea.
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